<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div id="demo">
        <input type="text" v-model="searchName">
        <ul>
            <li v-for="(p,index) in filterPersons":key="index">
                {{index}}---{{p.name}}---{{p.age}}
            </li>
        </ul>
        <button @click="setOrderType(1)">年龄升序</button>
        <button @click="setOrderType(2)">年龄降序</button>
        <button @click="setOrderType(0)">原本顺序</button>
    </div>
</body>
<script src="./js/vue.js"></script>
<script>
    new Vue({
        el:'#demo',
        data:{
            searchName:'',
            orderType:0,//0代表原本顺序，1代表升序，2代表降序
            persons:[
                {name:'Tom',age: 18},
                {name:'coc',age: 16},
                {name:'jjj',age: 17},
                {name:'xxx',age: 19},
            ]
        },
        computed:{

            filterPersons(){
                //取出相关的数据
                const {searchName,persons,orderType} = this
                //最终需要显示的数组
                let fPersons;
                //对persons进行过滤
                fPersons=persons.filter(p => p.name.indexOf(searchName)!== -1)
                //排序
                if (orderType!==0){
                    fPersons.sort(function (p1,p2) { //如果返回负数，p1在前，返回正数，p2在前
                        //1代表升序，2代表降序
                        if (orderType===2){
                            return p2.age-p1.age;
                        } else {
                            return p1.age-p2.age;
                        }

                    })
                }
                return fPersons;
            }
        },
        methods:{
            setOrderType(orderType){
                this.orderType = orderType;
            }
        }
    })
</script>
</html>